Originally Posted by
Flex81
FAR Part 135 Federal Aviation Regulations
(3) Whenever a pressurized aircraft is operated at altitudes above
35,000 feet MSL, at least one pilot at the controls shall wear, secured
and sealed, an oxygen mask required by paragraph (b)(2)(i) of this
section.
this is paragraph (b)(2)(i):
(i) At least one pilot at the controls shall wear, secured and
sealed, an oxygen mask that either supplies oxygen at all times or
automatically supplies oxygen
whenever the cabin pressure altitude
exceeds 12,000 feet MSL; and
So the way I read it, you only have to use the O2 mask if you are above
35,000 feet MSL
AND your cabin altitude exceeds 12,000 feet. Am I missing something?
Read higher above,
(i) At least one pilot at the controls shall wear, secured and
sealed, an oxygen mask that either supplies oxygen at all times
or
automatically supplies oxygen
whenever the cabin pressure altitude
exceeds 12,000 feet MSL; and
So based on this reg it either needs to supply oxygen always when its on, OR it automatically supplies in the event the cabin pressure reaches or exceeds 12,000.
You still have to have it on. It just might not be necessary to be sucking the oxygen.